Direct TV dish for FTA

I have been using an elliptical old Direct TV dish that has 2 LNBs to receive Telestar-5. Originally it had 2 LNBs (as it received also Middle East package when Direct TV carried it). Ntturally I replaced them with one alinear LNB, poorly fixed in the middle of the arm instead of the collars that held the old ones accurately and firmly. My signal quality is 60% max so eventually I have to get a better dish. After reading Darkmann's answer on Sep 25- that 105 Satellite is Linear-I like to try once more.
Does any one know if one of the original LNBs that came with the Hant antenna is linear?